I teach college. I need a mask that looks good and that won't slip off my face while I talk for an hour in front of a room of young adults. Pair of Thieves provides three masks for $15. The masks come in a variety of fashionable fabrics. They are double layered. They have a pocket for a disposable filter. They are easily adjustable. My kids have borrowed these and fit them without trouble. They wash easily without losing their shape. I am very happy with these masks.